In order to make the subject innovation is to avoid the eddy current generated when introduced into that, through the pressure oil return hose filled inside the hydraulic cylinders the oil tank on the oil tank structure for a dump truck, fed under pressure from the oil pump 10 pressure oil hydraulic cylinder oil return hose 40 to the mediated oil tank 50 to the 30 is connected, the oil tank 50, to the medium oil supply hose 60, the oil pump to be actuated to be in the dump truck oil tank structure for connected to a 10 so as to circulate the oil, separate vortex-proof connection pipe 70 which is inside in communication with the oil return hose (40) of the oil tank 50 is inserted and installed, the connecting pipe 70 to the connection hose 80, the medium consists of a connection installed structure to the oil pump 10, which occurs during the filling oil in the interior of the hydraulic cylinder is returned to an oil tank eddy current is prevented Therefore, not only the noise within the oil reservoir will be prevented from a possible to easily perform the work loading area fixed.
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